Table 1
Experiments performed in this study.
| No. | Experiments | Ratio |  |
Flux |
FluxH | Flux |
Flux |
Flux |
FluxCO | Time |
|---|---|---|---|---|---|---|---|---|---|---|
| CH4 :H:O2 | (K) | cm−2 s−1 | cm−2 s−1 | cm−2 s−1 | cm−2 s−1 | cm−2 s−1 | cm−2 s−1 | (s) | ||
| 1.0 | CH4 + H + O2 | 1:2:1 | 10 | 3E12 | 6E12 | 4E12 | – | – | – | 43 200 |
| 2.0 | CH4 + H + O2 | 1:2:1 | 10 | 3E12 | 6E12 | 4E12 | – | – | – | 21 600 |
| 2.1 | 13 CH4 + H + O2 | 1:2:1 | 10 | 3E12 | 6E12 | 4E12 | – | – | – | 21 600 |
| 2.2 | CH4 + H + 18O2 | 1:2:1 | 10 | 3E12 | 6E12 | 4E12 | – | – | – | 21 600 |
| 2.3 | 13 CH4 + H + 18O2 | 1:2:1 | 10 | 3E12 | 6E12 | 4E12 | – | – | – | 21 600 |
| 3.0 | CH3 OH | – | 10 | – | – | – | 4E13 | – | – | 100 |
| 4.0 | CH3 OH | – | 10 | – | – | – | 1E13 | – | – | 1200 |
| 4.1 | CH3 OH + O2 (MWAS)b | – | 10 | – | – | 4E13 | 1E11 | – | – | 9000 |
| 4.2 | CH3 OH + CH4 | – | 10 | 6E13 | – | – | 1E11 | – | – | 9000 |
| 4.3 | CH3 OH + H2 O | – | 10 | – | – | – | 1E11 | 6E13 | – | 9000 |
| 4.4 | CH3 OH + H2 O (MWAS)b | – | 10 | – | – | – | 1E11 | 6E13 | – | 9000 |
| 4.5 | CH3 OH + H2 O (MWAS)b + CH4 | – | 10 | 6E13 | – | – | 1E11 | 6E13 | – | 9000 |
| 4.6 | CH3 OH + CO | – | 15 | – | – | – | 2E10 | – | 7E10 | 3600 |
| 5.0 | 13 CH4 + H + 18O2 | 1:2:1c | 20 | 3E12c | 6E12 | 4E12 | – | – | – | 21 600 |
| 6.0 | CH4 + H + O2 | 1:2:1 | 10 | 3E12 | 6E12 | 1E13 | – | – | – | 21 600 |
Notes. All fluxes, except the H flux, are derived from the Hertz–Knudsen equation. (a) Temperature of the sample at which theices are grown. (b) The CH4 flux is lower than the listed value in order to have the same CH4 :H2O ice ratio as found in exp. 2.0. Thus, a constant CH4 flux is not carried out in this particular experiment. (c) “(MWAS)” denotes species that were placed in the MWAS chamber. See also Sect. 3.2.
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